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Re: Speedometer Accuracy

Pete,  I have done just that on my new GS.  Haven't found a way to 
confirm the accuracy of the bike speedo yet, but it reads about 2 mph 
below the bike speedo.  I was very surprised at that.

If one has GPS on the bike, is the speed display super accurate at any 
given moment?

Bob Hadden '05R12GS, '62R27

On Jun 2, 2005, at 8:48 AM, Pete and Nat Lavengood wrote:

> BMW Designs the speedos to read high. The intent is for the speedo to 
> always read high even with the largest possible tire mounted on the 
> front rim. They will not recalibrate as it is supposed to be this way. 
> Inexpensive and accurate solution is to get a bicycle speedo using a 
> magnetic pick-up mounted on the brake disc. This unit is calibrated to 
> to the tire on your bike. ie mark a spot on the tire and the pavement, 
> roll ten times and measure the distance between spots and divide by 
> 10. This is an accurate circumference of the loaded tire and is 
> entered into the bicycle speedo to calibrate it to your bike.
> From: "Gregory Appling" <gappling@xxxxxxxxxxxxxx>
> To: <oilheads@xxxxxxxxx>
> Sent: Wednesday, June 01, 2005 10:32 AM
> Subject: Speedometer Accuracy